[PATCH v2 1/3] vfio: Introduce map and unmap operations

[Pavel Fedin]

These new functions allow direct mapping and unmapping of addresses on the
given IOMMU. They will be used for mapping MSI hardware.

Signed-off-by: Pavel Fedin <p.fe...@samsung.com>
---
 drivers/vfio/vfio_iommu_type1.c | 29 +++++++++++++++++++++++++++++
 include/linux/vfio.h            |  4 +++-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 59d47cb..17506eb 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -558,6 +558,33 @@ unwind:
        return ret;
 }
 
+static int vfio_iommu_type1_map(void *iommu_data, dma_addr_t iova,
+                             phys_addr_t paddr, long npage, int prot)
+{
+       struct vfio_iommu *iommu = iommu_data;
+       int ret;
+
+       mutex_lock(&iommu->lock);
+       ret = vfio_iommu_map(iommu, iova, paddr >> PAGE_SHIFT, npage, prot);
+       mutex_unlock(&iommu->lock);
+
+       return ret;
+}
+
+static void vfio_iommu_type1_unmap(void *iommu_data, dma_addr_t iova,
+                                  long npage)
+{
+       struct vfio_iommu *iommu = iommu_data;
+       struct vfio_domain *d;
+
+       mutex_lock(&iommu->lock);
+
+       list_for_each_entry_reverse(d, &iommu->domain_list, next)
+               iommu_unmap(d->domain, iova, npage << PAGE_SHIFT);
+
+       mutex_unlock(&iommu->lock);
+}
+
 static int vfio_dma_do_map(struct vfio_iommu *iommu,
                           struct vfio_iommu_type1_dma_map *map)
 {
@@ -1046,6 +1073,8 @@ static const struct vfio_iommu_driver_ops 
vfio_iommu_driver_ops_type1 = {
        .ioctl          = vfio_iommu_type1_ioctl,
        .attach_group   = vfio_iommu_type1_attach_group,
        .detach_group   = vfio_iommu_type1_detach_group,
+       .map            = vfio_iommu_type1_map,
+       .unmap          = vfio_iommu_type1_unmap,
 };
 
 static int __init vfio_iommu_type1_init(void)
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 610a86a..061038a 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -75,7 +75,9 @@ struct vfio_iommu_driver_ops {
                                        struct iommu_group *group);
        void            (*detach_group)(void *iommu_data,
                                        struct iommu_group *group);
-
+       int             (*map)(void *iommu_data, dma_addr_t iova,
+                              phys_addr_t paddr, long npage, int prot);
+       void            (*unmap)(void *iommu_data, dma_addr_t iova, long npage);
 };
 
 extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
-- 
2.4.4

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